Mamma Mia 3: Everything We Know About The Cast’s Return (Plus 2 New Pop Stars Joining The Island)
The enduring, sun-drenched musical fantasy of Mamma Mia! continues to capture the world’s imagination, and as of late 2025, the buzz around a third film is louder than ever. Fans have been desperate for a return to the fictional Greek island of Kalokairi, and recent updates from the original cast and producers confirm that Mamma Mia 3 is not just a dream—it’s actively being planned, with the entire core cast ready to say "I Do" once more.
This article dives into the latest, most current information on the beloved ensemble, detailing who’s officially on board for the next installment, which major Hollywood names are rumored to be joining, and where the original stars have been since they last graced our screens in Mamma Mia! Here We Go Again.
The Complete Kalokairi Crew: Main Cast & Roles in Mamma Mia 1 & 2
The success of the Mamma Mia franchise, which grossed over $1 billion worldwide, is entirely dependent on its stellar ensemble cast. The two films, Mamma Mia! (2008) and Mamma Mia! Here We Go Again (2018), blended Hollywood royalty with rising stars to create a truly unforgettable musical experience.
Here is the full list of the main cast members who brought the magic of Donna Sheridan and her family to life:
- Meryl Streep as Donna Sheridan (The mother, founder of Donna and the Dynamos).
- Amanda Seyfried as Sophie Sheridan (Donna’s daughter).
- Dominic Cooper as Sky (Sophie’s husband).
- Julie Walters as Rosie Mulligan (One of Donna’s best friends and Dynamos members).
- Christine Baranski as Tanya Chesham-Leigh (The other of Donna’s best friends and Dynamos members).
- Pierce Brosnan as Sam Carmichael (One of Sophie’s three potential fathers, an architect).
- Colin Firth as Harry Bright (One of Sophie’s three potential fathers, a British banker).
- Stellan Skarsgård as Bill Anderson (One of Sophie’s three potential fathers, a Swedish travel writer).
The Prequel Cast (Mamma Mia! Here We Go Again):
- Lily James as Young Donna Sheridan.
- Jessica Keenan Wynn as Young Tanya.
- Alexa Davies as Young Rosie.
- Josh Dylan as Young Bill.
- Hugh Skinner as Young Harry.
- Jeremy Irvine as Young Sam.
- Cher as Ruby Sheridan (Donna’s mother, Sophie’s grandmother).
- Andy García as Fernando Cienfuegos (Hotel manager and Ruby’s former lover).
The Latest Mamma Mia 3 Cast Updates: Who’s In and Who’s Rumored to Join
The most exciting news for fans is the confirmation that a third film is in active development. Producer Judy Craymer, the creative force behind the original stage musical and films, confirmed in May 2025 that the project is moving forward.
The Core Cast Has Said "Yes"
The biggest hurdle for any sequel is reuniting its A-list cast, but the Mamma Mia stars are proving to be the exception. In September 2025, lead actress Amanda Seyfried, who plays Sophie Sheridan, confirmed that the entire original ensemble is eager to return. “The cast have all said ‘yes’,” Seyfried told Deadline, reflecting the shared desire among the actors to reunite on the mythical island of Kalokairi.
This includes the three legendary "Dads"—Pierce Brosnan (Sam), Colin Firth (Harry), and Stellan Skarsgård (Bill)—as well as the dynamic duo of Christine Baranski (Tanya) and Julie Walters (Rosie). Even Meryl Streep, whose character Donna Sheridan has a limited role in the second film, has expressed her enthusiasm to return, with the creative team reportedly exploring options for her involvement.
New Faces: Pop Stars and Hollywood A-Listers
To inject new energy into the franchise, rumors are swirling about adding major contemporary talent to the Mamma Mia 3 cast. This strategy mirrors the success of the second film, which introduced Lily James as Young Donna and Cher as Ruby Sheridan.
- Sabrina Carpenter: In a May 2025 update, producer Judy Craymer revealed that Grammy-winning pop star Sabrina Carpenter is being actively sought for a role in the third movie. Her casting would bring a fresh, modern pop edge to the ABBA musical universe.
- Sydney Sweeney: The Euphoria and Anyone But You star has also publicly expressed her openness to joining the cast, a sentiment echoed by Amanda Seyfried, who has been pushing for Sweeney’s involvement.
The potential addition of these younger stars suggests that Mamma Mia 3 will likely continue the generational storyline, perhaps focusing on a new chapter in Sophie and Sky's life, or introducing a brand new character to the island.
Where Are They Now? The Cast’s Major 2025 Projects
While the cast is preparing for their return to the world of ABBA, they have been busy with major projects across film and television. The recent work of the main stars proves their continued relevance and star power in 2025 and beyond.
Amanda Seyfried (Sophie Sheridan)
Amanda Seyfried continues to be one of Hollywood’s most in-demand actresses. Her 2025 slate is packed with major roles, including the lead in the Peacock crime drama Long Bright River. She is also set to star in the thriller film The Housekeeper, scheduled for a late 2025 release. Furthermore, she is attached to the musical project The Testament of Ann Lee, demonstrating her willingness to return to the musical genre.
The Dads: Brosnan, Firth, and Skarsgård
The three former James Bonds and Oscar winners have maintained prolific careers, often reuniting at awards shows, as Pierce Brosnan and Stellan Skarsgård did at the GQ Men Of The Year Awards 2025.
- Pierce Brosnan (Sam Carmichael): Brosnan started 2025 with a role in the spy thriller Black Bag and is set to star in the highly anticipated film adaptation of Richard Osman’s novel, The Thursday Murder Club. He is also starring in the 2025 film The Man Who Stole The Sky.
- Colin Firth (Harry Bright): Firth is confirmed to be returning to another iconic franchise role in the 2025 sequel Bridget Jones: Mad About the Boy, reprising his role as Mark Darcy. He is also starring in the 2025 drama Lockerbie: A Search for Truth, a project based on the Lockerbie disaster.
- Stellan Skarsgård (Bill Anderson): Skarsgård’s 2025 includes the drama film Sentimental Value, which premiered at the KVIFF festival, and he continues his acclaimed work across European and American cinema.
The Dynamos: Streep and Baranski
The legendary Donna and Tanya continue to dominate both film and television.
- Meryl Streep (Donna Sheridan): Streep, whose performance in the first film was a critical highlight, continues to take on diverse projects. While some 2025 projects are still listed as TBA, her recent work, including her appearance in the Hulu series Only Murders in the Building, keeps her firmly in the public eye. She is also attached to the historical drama The American Revolution.
- Christine Baranski (Tanya Chesham-Leigh): Baranski is currently starring as the formidable Agnes van Rhijn in the third season of the highly popular HBO period drama, The Gilded Age, which premiered at the 2025 Tribeca Festival.
Topical Authority: The Creative Team and ABBA’s Enduring Legacy
The Mamma Mia films are more than just a cast; they are a collaboration between a powerful female creative team and the timeless music of ABBA. Understanding these entities provides crucial context for the franchise’s success.
The Power Trio Behind the Scenes
The first Mamma Mia! movie was brought to the screen by the same three women who created the original stage show, a rare feat in Hollywood:
- Producer: Judy Craymer
- Writer: Catherine Johnson (for Mamma Mia!)
- Director: Phyllida Lloyd (for Mamma Mia!)
For the sequel, Mamma Mia! Here We Go Again, the reins were passed to Ol Parker, who served as both writer and director, while Judy Craymer remained the central producer, ensuring creative continuity.
ABBA’s Direct Involvement
The music is, of course, the heart of the franchise. ABBA members Benny Andersson and Björn Ulvaeus served as executive producers and were heavily involved in the music production for both films. They famously made cameo appearances in both movies: Benny Andersson as a piano player during "Dancing Queen" in the first film, and both he and Björn Ulvaeus appearing in the sequel.
The Real-Life Kalokairi: Filming Locations
The idyllic setting is a character in itself, inspiring countless tourists. The fictional island of Kalokairi was brought to life using two main locations:
- Original Film (2008): The majority of the outdoor scenes were filmed on the Greek island of Skopelos, with the famous wedding church scene shot at the cliff-top chapel of Agios Ioannis in Kastri. Other Greek locations included Skiathos and Damouchari.
- Sequel Film (2018): The production moved to the Croatian island of Vis, which stood in for the Greek setting, offering a fresh, yet equally stunning Mediterranean backdrop for the prequel/sequel narrative.
With the entire cast eager to return and the creative team actively planning the next chapter, Mamma Mia 3 is poised to be the next global box-office smash. The blend of familiar faces, new musical talent, and the timeless joy of ABBA’s music promises another unforgettable trip back to the island.
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